mirror of
https://github.com/EnderIce2/Fennix.git
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93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <syscalls.hpp>
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#include <cpu.hpp>
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#include "cpu/gdt.hpp"
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// https://supercip971.github.io/02-wingos-syscalls.html
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using namespace CPU::x64;
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// "Core/SystemCalls.cpp"
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extern "C" uint64_t SystemCallsHandler(SyscallsFrame *regs);
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extern "C" void SystemCallHandlerStub();
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extern "C" __naked __used __no_stack_protector __aligned(16) void SystemCallHandlerStub()
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{
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asmv("swapgs\n"
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"mov %rsp, %gs:0x8\n" // CPUData->TempStack
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"mov %gs:0x0, %rsp\n" // CPUData->SystemCallStack
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"push $0x1b\n" // user data segment
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"push %gs:0x8\n" // saved stack
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"push %r11\n" // saved rflags
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"push $0x23\n" // user code segment
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"push %rcx\n" // Current RIP
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"push %rax\n"
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"push %rbx\n"
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"push %rcx\n"
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"push %rdx\n"
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"push %rsi\n"
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"push %rdi\n"
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"push %rbp\n"
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"push %r8\n"
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"push %r9\n"
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"push %r10\n"
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"push %r11\n"
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"push %r12\n"
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"push %r13\n"
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"push %r14\n"
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"push %r15\n"
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"mov %rsp, %rdi\n"
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"mov $0, %rbp\n"
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"call SystemCallsHandler\n"
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"pop %r15\n"
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"pop %r14\n"
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"pop %r13\n"
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"pop %r12\n"
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"pop %r11\n"
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"pop %r10\n"
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"pop %r9\n"
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"pop %r8\n"
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"pop %rbp\n"
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"pop %rdi\n"
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"pop %rsi\n"
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"pop %rdx\n"
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"pop %rcx\n"
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"pop %rbx\n"
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"mov %gs:0x8, %rsp\n" // CPUData->TempStack
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"swapgs\n"
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"sti\n"
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"sysretq\n");
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}
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void InitializeSystemCalls()
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{
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wrmsr(MSR_EFER, rdmsr(MSR_EFER) | 1);
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wrmsr(MSR_STAR, ((uint64_t)(GDT_KERNEL_CODE) << 32) | ((uint64_t)(GDT_KERNEL_DATA | 3) << 48));
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wrmsr(MSR_LSTAR, (uint64_t)SystemCallHandlerStub);
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wrmsr(MSR_SYSCALL_MASK, (uint64_t)(1 << 9));
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}
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